IDB05A1 - Heart rate read

/* mbed Microcontroller Library
 * Copyright (c) 2006-2015 ARM Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "mbed.h"
#include "ble/Gap.h"
#include "ble/BLE.h"
#include "ble/DiscoveredCharacteristic.h"
#include "ble/DiscoveredService.h"
#include "ble/GapAdvertisingParams.h"


#define PRINTF(...) printf(__VA_ARGS__)

BLE  ble;
DigitalOut led1(LED1);


bool _connected = false;

DiscoveredCharacteristic hrmCharacteristic;
static volatile bool  triggerHrmCharacteristic = false;
//PROTOTYPES
void PrintScanResult(const Gap::AdvertisementCallbackParams_t *params);
void periodicCallback(void);
void connectToDevice(const Gap::Address_t peerAddr);

void serviceDiscoveryCallback(const DiscoveredService *service);
void characteristicDiscoveryCallback(const DiscoveredCharacteristic *characteristicP);
void discoveryTerminationCallback(Gap::Handle_t connectionHandle);


void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *params) {
    _connected = false;
    PRINTF("disconnected\r\n");
}

void periodicCallback(void)
{
    led1 = !led1; /* Do blinky on LED1 while we're waiting for BLE events */
    /* Note that the periodicCallback() executes in interrupt context, so it is safer to do
     * heavy-weight sensor polling from the main thread. */
    triggerHrmCharacteristic = true;
}

void PrintScanResult(const Gap::AdvertisementCallbackParams_t *params)
{
     for(int8_t i = 5; i>=0; i--)
    {
       PRINTF("%02x",params->peerAddr[i] );
       if(i != 0)PRINTF("-");
    }
    PRINTF("\r\n");

    PRINTF("RSSI: %d\r\n",params->rssi );

    if(params->isScanResponse){
        PRINTF("isScanResponse=true\r\n");
    } else {
        PRINTF("isScanResponse=false\r\n");
    }

    switch(params->type)
    {
     case GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED:
                                        PRINTF("ADV_CONNECTABLE_UNDIRECTED\r\n");
                                        break;
     case GapAdvertisingParams::ADV_CONNECTABLE_DIRECTED:
                                        PRINTF("ADV_CONNECTABLE_DIRECTED\r\n");
                                        break;
     case GapAdvertisingParams::ADV_SCANNABLE_UNDIRECTED:
                                        PRINTF("ADV_SCANNABLE_UNDIRECTED\r\n");
                                        break;
     case GapAdvertisingParams::ADV_NON_CONNECTABLE_UNDIRECTED:
                                        PRINTF("ADV_NON_CONNECTABLE_UNDIRECTED\r\n");
                                        break;

    }

    PRINTF("advertisingDataLen: %d\r\n",params->advertisingDataLen );

    PRINTF("advertisingData: ");
    for(int i=0; i < params->advertisingDataLen; i++)
    {
        PRINTF("%02x",params->advertisingData[i]);
        if(i != params->advertisingDataLen - 1)PRINTF("-");
    }
    PRINTF("\r\n");
}


void scanResultReceived(const Gap::AdvertisementCallbackParams_t *params)
{
    PRINTF("\r\nscanResultReceived\r\n");

    //print advertsing values
   PrintScanResult(params);

   PRINTF("scan result ... try connect\r\n");
   connectToDevice(params->peerAddr);
}

void connectToDevice(const Gap::Address_t peerAddr)
{
   ble_error_t  ret = ble.gap().connect(peerAddr, Gap::ADDR_TYPE_PUBLIC, NULL, NULL);

   if(ret == BLE_ERROR_NONE) {
           PRINTF("SUCCESS: connect\r\n");
          } else {
                 PRINTF("ERROR : connect\r\n");
                 }
}

void serviceDiscoveryCallback(const DiscoveredService *service) {
    PRINTF("Service discovery callback\r\n");

    if (service->getUUID().shortOrLong() == UUID::UUID_TYPE_SHORT) {
        PRINTF("S UUID-%x attrs[%u %u]\r\n", service->getUUID().getShortUUID(), service->getStartHandle(), service->getEndHandle());
    } else {
        printf("S UUID-");
        const uint8_t *longUUIDBytes = service->getUUID().getBaseUUID();
        for (unsigned i = 0; i < UUID::LENGTH_OF_LONG_UUID; i++) {
            printf("%02x", longUUIDBytes[i]);
        }
        PRINTF(" attrs[%u %u]\r\n", service->getStartHandle(), service->getEndHandle());
    }
}

void characteristicDiscoveryCallback(const DiscoveredCharacteristic *characteristicP) {
    PRINTF("Characteristic discovery callback\r\n");

    PRINTF("  C UUID-%x valueAttr[%u] props[%x]\r\n", characteristicP->getUUID().getShortUUID(), characteristicP->getValueHandle(), (uint8_t)characteristicP->getProperties().broadcast());
    //TODO: use hear rate characteristic
    if (characteristicP->getUUID().getShortUUID() == 0x2A00) {
        hrmCharacteristic = *characteristicP;
        triggerHrmCharacteristic = true;
       PRINTF("device name characteristic found\r\n");
    }
}

void discoveryTerminationCallback(Gap::Handle_t connectionHandle) {
    PRINTF("terminated SD for handle %u\r\n", connectionHandle);
}

void timeoutCallback(Gap::TimeoutSource_t param) {

    switch(param)
    {
        case Gap::TIMEOUT_SRC_ADVERTISING:
                                    PRINTF("Timeout: Advertising\r\n");
                                    break;
        case Gap::TIMEOUT_SRC_SECURITY_REQUEST:
                                    PRINTF("Timeout: Security access\r\n");
                                    break;
        case Gap::TIMEOUT_SRC_SCAN:
                                    PRINTF("Timeout: Scan\r\n");
                                    break;
        case Gap::TIMEOUT_SRC_CONN:
                                    PRINTF("Timeout: Conn\r\n");
                                    break;
    }
}

void connectionCallback(const Gap::ConnectionCallbackParams_t *params) {
    if (params->role == Gap::CENTRAL) {
        PRINTF("Launch service discovery\r\n");
        //TODO: use heart rate service
        ble.gattClient().onServiceDiscoveryTermination(discoveryTerminationCallback);
        ble.gattClient().launchServiceDiscovery(params->handle, serviceDiscoveryCallback, characteristicDiscoveryCallback, 0x1800, 0x2A00);
        _connected = true;
     //   ble.gattClient().launchServiceDiscovery(params->handle, serviceDiscoveryCallback, characteristicDiscoveryCallback, GattService::UUID_HEART_RATE_SERVICE, GattCharacteristic::UUID_HEART_RATE_MEASUREMENT_CHAR); //BLE_UUID_UNKNOWN
    }
    else {
        PRINTF("No central role\r\n");
    }
}


void readCallback(const GattReadCallbackParams *response)
{
    PRINTF("readCallback\r\n");

    if (response->handle == hrmCharacteristic.getValueHandle()) {
            PRINTF("readCallback: handle %u, offset %u, len %u\r\n", response->handle, response->offset, response->len);
            for (unsigned index = 0; index < response->len; index++) {
                PRINTF("%c[%02x]", response->data[index], response->data[index]);
            }
            PRINTF("\r\n");
        }
}

/**
 * This function is called when the ble initialization process has failled
 */
void onBleInitError(BLE &ble, ble_error_t error)
{
    PRINTF("BLE init error");
}

/**
 * Callback triggered when the ble initialization process has finished
 */
void bleInitComplete(BLE::InitializationCompleteCallbackContext *params)
{

    PRINTF("init complete\r\n");

    BLE&        ble   = params->ble;
    ble_error_t error = params->error;

    if (error != BLE_ERROR_NONE) {
        /* In case of error, forward the error handling to onBleInitError */
        PRINTF("Error init\r\n");
        onBleInitError(ble, error);
        return;
    }

    /* Ensure that it is the default instance of BLE */
    if(ble.getInstanceID() != BLE::DEFAULT_INSTANCE) {
        PRINTF("Error default instance\r\n");
        return;
    }

   ble.onTimeout(timeoutCallback);
   ble.onConnection(connectionCallback);
   ble.onDisconnection(disconnectionCallback);
   ble.gattClient().onDataRead(readCallback);

    ble.gap().setScanParams(300, 300);
    ble.gap().startScan(scanResultReceived);
    PRINTF("scan started...\r\n");


    // infinite loop
    while (1) {
        // check for trigger from periodicCallback()
         if (triggerHrmCharacteristic && !ble.gattClient().isServiceDiscoveryActive() && _connected) {

            triggerHrmCharacteristic = false;
            PRINTF("START READ\r\n");
            hrmCharacteristic.read();

        } else {
            ble.waitForEvent(); // low power wait for event
        }
    }




}

int main(void)
{
    PRINTF("started...\r\n");

    led1 = 1;
    Ticker ticker;
    ticker.attach(periodicCallback, 1); // blink LED every second

    _connected = false;

    PRINTF("start init...\r\n");

    ble.init(bleInitComplete);
}